Hydraulic Bi-Directional Rotary Isolation Valve

Abstract

A valve having a sealing surface that is rotated 90 degrees on trunnions that move along a track is provided. A sleeve that moves into position to protect the valve mechanism when the valve is in an open position is provided. A second sleeve locks the sealing element of the valve in place in the closed position. The valve may be used during drilling of wells to prevent flow in casing when the drill pipe and bit are raised above the valve.

1 . A valve for operation in a tube, comprising:
 a housing adapted for joining to the tube:   a valve element having a curved surface for sealing and a pair of trunnions on the valve element, each of the trunnions having a guiding element attached thereto;   a pair of tracks adapted to receive the guiding element attached to the trunnions, each of the tracks having a pivot point for rotating the orientation of the valve element;   a valve seating surface;   a protective sleeve adapted to move over the valve element when it is in an open position; and   a locking device for locking the valve element in a closed position.   
   
   
       2 . The valve of  claim 1  wherein the tube may be a casing to be placed in a well. 
   
   
       3 . The valve of  claim 1  wherein the curved surface of the valve element is formed from a metal. 
   
   
       4 . The valve of  claim 1  wherein the curved surface of the valve element is formed from a polymeric material. 
   
   
       5 . The valve of  claim 1  further comprising a bypass valve to vent excess pressure across the valve.